/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package xin.alum.aim.client.socks;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.timeout.IdleStateHandler;
import xin.alum.aim.coder.*;
import xin.alum.aim.config.AimConfig;
import xin.alum.aim.constant.AimAttr;

import java.util.concurrent.TimeUnit;

/**
 * Creates a newly configured {@link ChannelPipeline} for a new channel.
 */
public class SocksClientInitializer extends ChannelInitializer<SocketChannel> {

    private final SslContext sslCtx;
    private final AimConfig aimConfig;

    public SocksClientInitializer(SslContext sslCtx, AimConfig clientProperties) {
        this.sslCtx = sslCtx;
        this.aimConfig = clientProperties;
    }

    @Override
    public void initChannel(SocketChannel ch) {
        ChannelPipeline pipeline = ch.pipeline();
        ch.attr(AimAttr.AGREEMENT).set(aimConfig.getAgreement());
        if (sslCtx != null) pipeline.addLast(sslCtx.newHandler(ch.alloc()));
        pipeline.addLast(new IdleStateHandler(3, 3, 5, TimeUnit.SECONDS));
        switch (aimConfig.getAgreement()) {
            case Text:
                pipeline.addLast(new TextDecoder());
                break;
            case Json:
                // 需要指定要对哪种对象进行解码
                pipeline.addLast(new JsonDecoder());
                break;
            case Binary:
            case ProtoBuf:
                // 半包的处理
                // 需要解码的目标类
                ch.pipeline().addLast(new ProtoDecoder());
                break;
            case Tlv:
                ch.pipeline().addLast(new TagDecoder());
                ch.pipeline().addLast(new LengthDecoder());
                ch.pipeline().addLast(new ProtoDecoder());
                break;
            default:

                break;
        }
        ch.pipeline().addLast(new SocksEncoder());
        pipeline.addLast(new SocksClientHandler());
    }
}
